Care should be exercised with regard to the following in order to avoid the possibility of liquid leakage, overheating, or bursting.
Do not expose the battery pack to shock.
Do not touch the terminals on the battery pack. The battery pack may no longer function properly if the contacts are dirty or damaged.
If the battery leaks and the fluid gets into your eyes, do not rub your eyes. Immediately flush your eyes with clear water and see a doctor for medical treatment as soon as possible.
If the battery emits an abnormal odor, becomes hot to the touch, becomes discolored, changes shape, or becomes in any way different from normal, remove it from the computer or charger and discontinue use.
Do not expose the battery pack to water, or allow it to become wet.
The battery pack is not charged when it is first purchased. Be sure to charge it before using it for the first time.
The operating time and charging time (power on) differ depending on the computer model. For other than model number listed below, refer to the Operating Instructions accompanying the computer concerned.
The computer's allowable operating temperature range is 5ºC (41ºF) to 35ºC (95ºF). The duration of a battery's operation will be less at any temperature outside the allowable range.
The battery pack is a consumable item. If the amount of time the computer can be run off a particular battery pack becomes dramatically shorter and repeated rechargings do not restore its performance, the battery pack should be replaced with a new one.
When a spare battery pack is to be carried in a pocket or bag, it is recommended that it be placed in a plastic bag so that its contacts are protected.
The battery pack may become warm during recharging or use. This is completely normal.
Although the battery has remaining capacity, the battery indicator may light up red or emit a beep. This indicates a significant rise in the temperature of the battery pack. This is typically caused by the fact that the battery pack has been delivering a high level of power because the computer has been used with the display at the brightest setting and with the 
Always power off the computer when it is not in use. Leaving the computer on when the AC adapter is not connected will exhaust the remaining battery capacity.
If the battery pack will not be used for a long period of time (a month or more), charge or discharge (use) the battery pack until the remaining battery level becomes 30% to 40% and store it in a cool, dry place.
Refer to the Operating Instructions and Reference Manual accompanying the computer.
The battery pack is not charged when it is first purchased. 
To charge the battery pack using the optional battery charger 
CF-VZSU09 specifications
The Panasonic CF-VZSU09 is a high-performance battery designed specifically for the Toughbook line of rugged laptops. This rechargeable lithium-ion battery is engineered to provide reliable power and extended usage in harsh environments, making it a preferred choice for professionals in various industries such as military, field service, and public safety.One of the main features of the CF-VZSU09 is its impressive capacity. With a capacity of approximately 6,600 mAh, this battery ensures that users can work longer without interruptions. This is particularly important for field workers who may not have access to charging facilities throughout the day. The CF-VZSU09 is designed to deliver a runtime that meets the demands of intensive applications, allowing professionals to focus on their tasks without constantly worrying about battery life.
Another significant characteristic of the CF-VZSU09 is its rugged design. Built to withstand drops, vibrations, and extreme temperatures, the battery is fully aligned with the Toughbook philosophy of durability. It complies with military specifications for ruggedness, which means it can endure the challenges of outdoor and industrial environments. This robustness not only extends the lifespan of the battery itself but also ensures that it will continue to perform even under the toughest conditions.
The battery also features smart power management technology. This technology helps optimize the power consumption of the Toughbook, contributing to longer runtimes and reducing the overall wear on the battery. It allows users to monitor battery health and status, ensuring that any potential issues are identified early.
In terms of compatibility, the CF-VZSU09 is designed specifically for several Toughbook models, which includes the CF-31, CF-53, and CF-74. This tailored design ensures that users get the best performance possible and makes installation seamless without requiring any additional adapters or modifications.
Additionally, Panasonic has prioritized safety features within the CF-VZSU09. It comes equipped with protection against overcharging, overheating, and short-circuiting, which are essential considerations for users operating in demanding situations.
In summary, the Panasonic CF-VZSU09 is a powerful, durable, and reliable battery option for Toughbook users. Its high capacity, rugged design, power management technology, and built-in safety features make it an excellent choice for professionals who need dependable performance in challenging environments. Whether out in the field or in a tough industrial setting, the CF-VZSU09 ensures that users can rely on their Toughbook for extended periods without compromise.